Refraction-reflection type medium-wavelength focal lens

• Main Authors: LIN SEN, JIANG HUA, ZHANG CHANGWEI, RUAN SHIJUAN, ZHANG FADING, CHEN LINA
• Format: Patent
• Language: Chinese; English
• Published: 05.05.2023
• Subjects: OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

An optical system of the lens is composed of a reflecting mirror set A and an imaging mirror set B. The reflecting mirror set A is composed of a plano-concave primary mirror A1 and a plano-convex secondary mirror A2, a central through hole is formed in the middle of the plano-concave primary mirror A1, the plano-convex secondary mirror A2 and the central through hole are coaxially arranged at intervals, and the plano-concave primary mirror A1 and the plano-convex secondary mirror A2 are both made of quartz glass. The imaging lens group B is composed of a meniscus positive lens B1, a meniscus positive lens B2, a meniscus positive lens B3, a meniscus negative lens B4, a meniscus positive lens B5, a meniscus positive lens B6, a biconcave negative lens B7 and a biconvex positive lens B8. The imaging lens group B is made of a conventional infrared material. The lens has the characteristics of compact and short structure, stability, reliability, low cost and the like, and is suitable for the fields of foresight inf